昭和コンクリート工業 List of Products and Services

■To prevent the deterioration of concrete structures! ■Reinforced existing bridges damaged by salt damage and other factors while in use. ■Renewed the bridge with minimal traffic restrictions!!

• others

■It is a precast concrete box culvert made of reinforced concrete according to the National Box Culvert Association standards, following the recommended specifications of JIS A 5372. ■Standardized dimensions range from width 0.6m × height 0.6m to width 3.5m × height 2.5m.

• Dam construction
• Water Supply Facilities
• Sewerage facilities

By placing PC steel materials on the top and bottom plates, it is possible to reduce the thickness of the members, resulting in a lighter structure compared to RC box culverts. Standard sizes range from a width of 1.8m × height of 1.2m to a width of 5.0m × height of 2.5m.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■It can be installed in a top-down manner. ■Standard sizes are from 0.3m wide × 0.3m high to 0.6m wide × 0.6m high. For specifications other than the above, please consult us.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■There are two types, K-type and T-type, depending on the required performance. 【K-type】 It has water-tightness that can withstand a water pressure of 0.06 MPa under level 2 seismic motion in non-liquefiable, non-inclined ground conditions. 【T-type】 It has water-tightness that can withstand a water pressure of 0.06 MPa under level 2 seismic motion. ■By absorbing ground displacement at each joint of the product, it is possible to reduce the stress generated in the structure and minimize the amount of pull-out and bending angle occurring at each joint. ■The special rubber ring has a two-layer structure, with soft rubber covered by hard rubber on the outside, providing excellent followability, compression recovery, and wear resistance. ■High water-tightness can be achieved with the special rubber ring alone, eliminating the need for internal joint work.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ The "S-Hole - Large Assembled Box-Type Manhole" can accommodate level 2 seismic motions as indicated in the "Guidelines and Explanations for Seismic Measures of Sewer Facilities" published by the Japan Sewerage Association in most cases. ■ To meet the needs of the site, we have standardized 13 sizes ranging from 1000mm × 1000mm to 3500mm × 1500mm. ■ Since the components are assembled sequentially from the foundation block to the manhole cover, on-site construction is easy and does not require skilled workers. ■ The foundation block section is divided into two parts, making it easy to install inflow and outflow pipes. ■ As a factory-produced product with quality control, there is no variation in quality or strength.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■Among large box culverts, it is applied to relatively small cross-sections ranging from 4.0m to 6.0m in width. ■The components manufactured in upper and lower sections are integrated using mechanical joints and other methods.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ This is a box culvert that is divided into a top slab component, side wall components, and a cast-in-place bottom slab component. ■ After assembling the top slab and side wall components manufactured in the factory on-site, cast-in-place concrete is poured for the bottom slab. ■ Among large box culverts, it is suitable for large cross-sections ranging from 5.5 m to 10.0 m in width, and the components manufactured in two parts are integrated using mechanical joints and other methods.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ It is applicable to large box culverts with a cross-section width ranging from 5.5 m to 10.0 m. ■ The components manufactured in sections are integrated using mechanical joints and other methods.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■NETIS CB-080002-A (Publication Ended) ■This is a box culvert constructed with PC steel materials for the top slab and side wall components, designed with a PRC structure. ■It is suitable for ultra-large cross-sections ranging from 10.0m to 13.0m in width. (Please consult us if exceeding 13.0m) ■The top slab and side wall components are made of precast concrete, while the bottom slab component is constructed with cast-in-place concrete. ■To shorten the construction period, it is also possible to use precast components for the bottom slab. ■The angle can be freely set up to 75°. (Please contact us for angles less than 75°) ■It is widely adopted at many sites as an alternative to small-scale bridges.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ The "Oblique Super Wide Box" is applicable to ultra-large cross-sections ranging from 10.0m to 13.0m in width. ■ The oblique angle can be freely set within the range of 75° to 90°. ■ By setting the oblique angle to match intersecting rivers or roads, it enables a highly flexible design that promotes effective land use. ■ It is also compatible with other forms such as portal culverts. ■ To accommodate faster construction, it is also possible to use precast elements for the bottom slab.

• Secondary steel products
• Foundation construction
• Other civil engineering works

The "Top Slab Split Super Wide Box" features a structure that divides the top slab components into three parts, allowing for a box culvert with an internal width of 15 meters. To integrate the divided top slab components, PC steel materials are arranged using technology adapted from segmental girder bridges. By effectively introducing prestress with the arrangement of PC steel materials corresponding to the sectional forces, the thickness of the components is minimized. *For more details, please download the materials or contact us through our website.

• Secondary steel products

The FA Box - "Oblique Large Box Culvert" is a large-section box that combines three divided precast components with cast-in-place concrete. By using a segmented structure for the top slab and side walls, it becomes easier to accommodate the "oblique" design. The precast components are designed as a slab structure, and with the bottom slab being cast on-site, it enables the construction of an economically efficient large box. The use of loop joints to integrate the precast components facilitates easy construction and shortens the construction period.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ It is possible to accommodate high soil coverage. ■ It has high constructability that allows for self-supporting. ■ The connection parts are rigidly bonded. ■ No special work is required.

• Secondary steel products
• Foundation construction
• Other civil engineering works

This is a method of embedding rails in the foundation concrete and using steel balls and winches to pull and move concrete secondary products smoothly. It allows for installation work to be carried out smoothly even in urban areas where direct crane installation is not possible, under elevated roads and railways, or in places where temporary roads cannot be set up. There is no need to move the crane for lowering the products. This method can be used for laying products that involve foundation concrete, such as box culverts, L-shaped retaining walls, and flumes.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■It is also possible to accommodate products such as angled cutting and short cutting processing. ■There are two types available depending on soil conditions and other factors.

• Retaining wall

■It is also possible to accommodate products such as angled cutting and short cutting processing. ■There are two types with different upper load conditions.

• Retaining wall

■NETIS CB-100045-A (Publication Ended) ■This is an L-shaped retaining wall for roads, standardized in accordance with the "Guidelines for Road Earthworks - Retaining Wall Works" and "Installation Standards and Explanations for Protective Fences," which integrates a foundation for vehicle protective fences. ■By integrating the L-shaped retaining wall with the vehicle protective fence foundation, significant cost reductions and shortened construction periods are achieved, while maximizing the road width. ■It is possible to perform a sloped cut at the top, allowing installation without tilting the product even on road longitudinal slopes of about 15%. ■The standard product can accommodate horizontal alignments with a minimum radius of approximately R=20m. ■Standardized heights range from H=1,000 to 4,000.

• Retaining wall

■ This is an L-shaped retaining wall standardized according to the "Guidelines for Road Earthworks - Retaining Walls," which allows for the installation of pedestrian and bicycle fences or barriers at the top of the wall. ■ A horizontal load of 0.4 kN/m is assumed for the protective fence. ■ There are two types: one for sidewalk loads and one for roadway loads. ■ In addition to road retaining walls, it has various applications such as parking lots and outfield fences in baseball fields. ■ Post holes are provided at 1.0 m intervals. ■ It is standardized from H800 to H3,500. This is an L-shaped retaining wall that allows for the installation of pedestrian and bicycle fences or barriers at the top of the wall.

• Retaining wall

The "SL Retaining Wall - Multi SL-F" is an L-shaped retaining wall for road use with a foundation for protective fences, designed to accommodate any longitudinal slope through sloped processing at the top of the wall (supports slopes up to 15%*1). By integrating the retaining wall and the protective fence foundation, we have significantly simplified the installation process of the protective fence and shortened the construction period. Since posts can be installed at the top of the retaining wall, the road width can be maximized. *Thanks to the specially shaped base plate, it can flexibly accommodate horizontal curves. Post holes are provided at 1-meter intervals, allowing for compatibility with protective fences and fences with post spacings of 2 meters and 3 meters. Under certain conditions, it can also accommodate slopes greater than 15%.

• Retaining wall

The "SL Retaining Wall - SL-J" is one of the largest split-type all-precast L-shaped retaining walls in history, with a maximum wall height of 10.0m. It can be applied to wall heights ranging from 5.0m to 10.0m. It allows for easy construction without the need for cast-in-place concrete, achieving a reduction in construction time and labor efficiency on site. It is designed to withstand Level 2 seismic motion (Kh=0.24) and can accommodate top edge sloping (longitudinal gradient). It is also compatible with the installation of fences (protective barriers for pedestrians and cyclists) at the top edge, as well as with cast-in-place concrete types for the base slab. Fence post mounting holes can be installed at the top edge as needed.

• Retaining wall

■ The "SL Retaining Wall / SL-R" is an effective reverse L-shaped retaining wall that is useful when it is difficult to install a heel slab due to boundary conditions of the retaining wall site or nearby structures. ■ Being a precast product, it significantly shortens construction time and achieves labor-saving and manpower-reducing effects on site work. ■ The sloped processing of the top edge of the retaining wall not only accommodates longitudinal slopes (up to a 15% slope) but also allows for flexibility. ■ The special trapezoidal shape of the bottom slab enables flexible adaptation to horizontal curves. ■ It is also possible to provide fence installation holes at the top of the retaining wall, allowing it to accommodate a wide range of site conditions. *1 Depending on conditions, it may also accommodate slopes exceeding 15%. *2 Fence hole accommodations are handled on an individual basis.

• Retaining wall

The "PCa Rigid Protective Wall" is a product that achieves significant shortening of construction time by integrating a concrete rigid protective fence and an L-shaped retaining wall. Since dangerous tasks such as rebar assembly and formwork installation at heights are no longer necessary, safety on site is improved. There are two types available: a 250mm type for the top thickness and a 300mm type that allows for the installation of sound barriers, with standardized retaining wall heights ranging from 1.5m to 3.5m. During stability assessments, the connection state is considered at 10m, and for component assessments, it is checked at the product length (2.0m). *Note: It does not accommodate sloped cuts at the top. *Note: It is also possible to accommodate short-cut processed products.

• Retaining wall

■This is a ministerial certified product for land development according to Article 14 of the Land Development Regulation Enforcement Order. ■It is an L-shaped retaining wall for residential land that is designed to withstand large-scale seismic motions (design horizontal seismic intensity Kh=0.25). ■It can be used at sites with a wall height of up to 3 meters. ■It can also be used for road applications with separate design. ■We also offer products specifically for corners.

• Retaining wall

The "SL Type IV Corner" is a corner product of L-shaped retaining walls for residential land that is designed to withstand large-scale seismic movements. It can be used on sites with a wall height of up to 3 meters. With separate design, it can also be used for road applications.

• Retaining wall

The "High Touch Wall (Ministerial Certification for Medium Earthquake Use)" is a ministerial certified product for land development according to Article 14 of the Land Development and Other Regulations Enforcement Order. It can be used on sites with a retaining wall height of 3.0m to 5.0m. Ribs are provided on the back to enhance the rigidity of the retaining wall.

• Retaining wall

The "High Touch Wall (Ministerial Certification for Major Earthquakes)" is a ministerially certified product for land development under Article 14 of the Land Development and Regulation Act Enforcement Order. It can be used on sites with a retaining wall height of 3.0m to 5.0m. A rib section is provided on the back to enhance the rigidity of the retaining wall.

• Retaining wall

■NETIS CB-080014-A (Publication Ended) ■This is a retaining wall that obtained construction technology review certification from the Public Interest Incorporated Foundation Civil Engineering Research Center in October 2007. ■The vertical wall section of the cast-in-place reinforced concrete retaining wall is made of precast reinforced concrete products, achieving efficiency in construction and improved quality. Depending on site conditions, the base slab can also be proposed as precast. ■The product features a wide opening for the counter wall, making on-site construction such as rebar assembly and concrete pouring easier. ■The front wall thickness of the product is the same for all types, allowing for easy construction from the back without the need for block work. ■The front of the product is finished for aesthetic purposes, accommodating landscape conditions. ■The specifications of the product can be selected according to the distribution of earth pressure, allowing for economical design. ■The maximum applicable height for the retaining wall is approximately 14 meters. (Please consult regarding applicable height.)

• Retaining wall

■NETIS CB-040038-A (Publication period ended) ■This is a retaining wall that obtained construction technology examination certification from the Public Interest Incorporated Foundation Civil Engineering Research Center in March 2004. ■Due to its flexible structure, it reduces the stress generated by the slight movement of the retaining wall against soil pressure during an earthquake, thereby suppressing cracking and collapse of the wall. ■The ground reaction force during an earthquake is relatively small, and it demonstrates adaptability to differential settlement of the foundation ground and backfill soil, maintaining the overall safety of the retaining wall. ■The layer of single-sized crushed stone has extremely high drainage capacity, which inevitably stabilizes the backfill soil. ■Since there is almost no work involving rebar, concrete, or formwork at the construction site, significant reductions in construction time and improvements in cost-effectiveness can be achieved. ■The product can be used in a reversed manner, making it easy to construct curves. ■The stepped shape has a three-dimensional aesthetic appeal, and it is possible to consider ecosystem preservation through planting and natural greening using each small step. ■The maximum wall height in construction achievements is 21m. (Please consult us regarding applicable heights) *For more details, please download the materials or contact us through our company website.*

• Retaining wall

■NETIS CB-100043-A (Publication Ended) ■This is a large block retaining wall type that stacks large precast blocks at a slope of 1:0.5 (standard) and fills the blocks with concrete. ■The product's retaining wall has a large opening, allowing for integration with cast-in-place concrete. ■It is easy to set the thickness of the components according to design conditions, making it possible to create an economical retaining wall. ■By using dedicated hardware, the product can be lifted horizontally. ■The product lengths are available in 2m and 1m, and the product heights are 1m and 0.5m, allowing for flexible adaptation to site layouts. ■The maximum applicable retaining wall height is approximately 15m. (Please consult us regarding applicable heights.)

• Retaining wall

★Lightweight materials around 600kg, easy to handle!! ■ There are few transportation restrictions, making it possible to transport and construct in narrow spaces. ■ Construction can be done with a crane-equipped backhoe, making it easy to maneuver. *1 ★Half precast structure!! ■ Significantly shortens construction time and achieves labor-saving and efficiency in construction. ■ Since it only involves stacking blocks, it minimizes the need for special tasks like formwork. *2 ■ The surface becomes precast material, allowing for a beautiful and high-quality finish. ★Thorough pursuit of construction efficiency!! ■ There are few types of blocks, making product management easy. ■ By standardizing the product length to 3.0m, construction efficiency can be greatly increased. ■ The use of joint pins makes alignment easy. *For vertical wall sections ■ Unifying the bolt specifications improves constructability. ■ The special drainage hole shape makes the installation of drainage pipes easy. ■ The sloped wall sections can also serve as scaffolding. *1 There may be restrictions depending on the working radius, etc. *2 Formwork for end and top concrete will be necessary.

• Retaining wall

Type 1 is primarily installed on sidewalks. Type 3 is rarely adjacent to vehicles, and even when it does occur, it is installed parallel to the roadway in places where vehicles travel at low speeds, such as during temporary stops.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■Type 1: Primarily installed on sidewalks. ■Type 2: It is rare for vehicles to run adjacent to it, and even if they do, it will be installed parallel to the roadway in places where they run at low speeds, such as during temporary stops.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■It can set the drainage slope appropriately and form a vertical rectangular water flow cross-section. ■It is designed for a 25-ton vehicle. ■Due to its frame structure, the overall strength is balanced. ■To support product arrangement suitable for the site, the side wall height is standardized in 10 cm increments. ■A wide variety of types are available, including for adjusting fractions, corner cuts, support line installations, and cross sections.

• Secondary steel products
• Foundation construction
• Other civil engineering works

It is a product that possesses five characteristics: economic efficiency, functionality, high constructability, high quality, and beauty.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■Single-sided pedestrian-vehicle boundary block: Used for boundaries with a height difference between the pedestrian and vehicle areas. ■Double-sided pedestrian-vehicle boundary block: Used for boundaries without a height difference between the pedestrian and vehicle areas. ■Property boundary block: Primarily used for the boundary between the sidewalk and private land.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■L-shaped drainage channel JISA5372 - Mainly used for mount-up types below 100mm. ■L-shaped drainage channel JISA5371 - It is rare for vehicles to run adjacent to each other, and even when they do, it is in places where they run at low speeds, such as during temporary stops, and is installed parallel to the roadway.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■This is a precast protective fence foundation standardized in accordance with the "Installation Standards and Explanations for Protective Fences." ■It is standardized in compliance with the "Installation Standards and Explanations for Protective Fences." ■It corresponds to protective fence types A (impact load P=50kN), B, and C (impact load P=30kN). ■This product can bear the loads acting on the protective fence by itself. ■It accommodates standard products with an outer bending radius of R=8m and an inner bending radius of R=12m for planar configurations. ■The basic extension of the foundation is 8m or more. (Please consult us for lengths less than 8m.) ■Even if the pre-guard is damaged, partial replacement is possible.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ It is standardized in accordance with the "Installation Standards and Explanations for Protective Fences." ■ It corresponds to protective fence types A (impact load P=55kN), B, and C (impact load P=30kN). ■ It has a shape reminiscent of a bicycle chain, allowing for flexible adaptation to curves. ■ It can also be used as a temporary protective fence foundation for lane restrictions and lane guidance.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■Reduction of environmental impact on the mountain and valley sides - Due to the cantilever structure, excavation of the mountain side is unnecessary, which minimizes the impact on the valley side, such as rivers and waterways. ■Early traffic opening - By using precast products, temporary construction can be reduced, leading to a shorter construction period. ■Cost reduction possible - By removing part of the existing retaining wall's top and installing blocks, reconstruction of the retaining wall is unnecessary, resulting in cost savings. ■Compatibility with vehicle protective fences - It is compatible with vehicle protective fences (Type B and Type C), and the installation span for P-type support allows for compatibility with both vehicle and sidewalk protective fences. ■Road widening according to regional characteristics - Depending on regional characteristics, it can accommodate specifications for either large vehicles or medium vehicles.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■Stable Structure - By connecting the products with anchor bolts installed post-construction in the foundation concrete poured on-site, the structure integrates vertically and horizontally. - Using precast foundations allows for a completely dry construction method. ■Excellent Safety - The foundation concrete and the weight of the soil on the bottom plate provide resistance against tipping and sliding, ensuring stability. - The sidewalk area can incorporate circular anti-slip patterns to prevent slipping. ■Improved Drainage - With a 2.0% slope on the sidewalk and drainage holes and joint holes in the side walls, drainage is enhanced, making it difficult for water to accumulate behind the side walls.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■ Significant shortening of construction time is possible. ■ Next work can be carried out immediately after block installation. ■ Blocks can be connected with bolts. ■ Smooth construction is possible. ■ The structure can absorb construction variations of up to 5 cm in the position of the catch basin. ■ Space for installing electrical conduits, drainage pipes, etc., inside the auditor's passage is secured to be equal to or greater than that of conventional site-cast methods. ■ The structure is designed to minimize the likelihood of debris getting caught in the slits. ■ The circular waterway section considers T-25 direct and side loads in the longitudinal direction. ■ The shape takes into account construction machinery (set forms, slip forms).

• Secondary steel products
• Foundation construction
• Other civil engineering works

■This is a standard of the Agricultural Civil Engineering Association. ■It standardizes widths from 1.0m to 3.0m and heights from 0.7m to 2.0m. ■The types are classified based on the superimposed load acting on the horizontal line at the top of the side wall and the soil conditions.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■This is a standard of the Agricultural Civil Engineering Association. ■It standardizes widths from 1.0m to 3.0m and heights from 0.7m to 2.0m. ■The types are classified based on the superimposed load acting on the horizontal line at the top of the side wall and the soil conditions.

• Secondary steel products
• Foundation construction
• Other civil engineering works

■This is a lightweight three-sided water channel with a thin material thickness. ■The standard dimensions are a top width of 0.6m × height of 0.8m to a top width of 2.0m × height of 1.5m.

• Secondary steel products
• Foundation construction
• Other civil engineering works